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The equation of the line is of the form y = 3x + c where c is a constant.

The point (4,9) is on the line, so substituting x=4, y=9 in the equation,

9 = 3*4 + c = 12 + c so c = -3

So the equation of the line is y = 3x - 3

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Q: Write the equation in slopeintercept form of the line that has a slope of 3 and contains the point 4 9?
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